Safety and Immunogenicity Study of SCB-1019T in Children

Inclusion Criteria: • Male and female participants 2 to \<6 years of age at Visit 1. • Parents/guardians of participants willing and able to provide written informed consent and comply with study requirements, including all scheduled visits, vaccination, laboratory tests, and other study procedures. • Healthy participants as determined by medical history, physical examination, and clinical judgment of the investigator. For full inclusion criteria, please refer to full protocol. Exclusion Criteria: * Acute disease or fever (≥38°C) at time of vaccination. For participants with minor illness and/or fever at the time of vaccination, Visit 1 may be rescheduled. * Evidence of chronic diseases including hepatitis, bleeding disorders, metabolic diseases, autoimmune diseases, neurological conditions that impair respiratory functions, genetic disorders that increase the risk of severe respiratory diseases, major congenital malformations, cardiac and lung diseases or reactive airway diseases. For full Exclusion criteria, please refer to full protocol